2778742 has 4 divisors (see below), whose sum is σ = 4168116. Its totient is φ = 1389370.

The previous prime is 2778739. The next prime is 2778779. The reversal of 2778742 is 2478772.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694684 + ... + 694687.

It is an arithmetic number, because the mean of its divisors is an integer number (1042029).

2^2778742 is an apocalyptic number.

2778742 is a deficient number, since it is larger than the sum of its proper divisors (1389374).

2778742 is a wasteful number, since it uses less digits than its factorization.

2778742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389373.

The product of its digits is 43904, while the sum is 37.

The square root of 2778742 is about 1666.9559082351. The cubic root of 2778742 is about 140.5883741324.

The spelling of 2778742 in words is "two million, seven hundred seventy-eight thousand, seven hundred forty-two".